Geometric Origin of Dark Components: A Causal-Asymmetry Hypothesis

The author proposes a hypothesis in which the only physically real energy component of the universe is ordinary baryonic matter, and the phenomena conventionally attributed to dark matter and dark energy are reinterpreted as geometric and causal-asymmetry effects arising from the relative volumes of three cosmological horizons: the Hubble radius (R_H), the cosmic event horizon (R_EH), and the particle horizon (R_PH). Using Planck 2018 parameters, two independent numerical coincidences are reported. First, the volume ratio between the inner Hubble sphere and the spherical shell bounded by R_H and R_EH approximately matches the observed Omega_c / Omega_b ratio (~20% agreement). Second, the gravitational acceleration produced at the event horizon by the baryonic mass enclosed in the donut-shaped shell between R_EH and R_PH matches the Friedmann acceleration to within ~10% when only baryons are taken as the gravitational source. The Rindler universe — defined here as the self-consistent domain of the cosmic acceleration field, with boundary d_* = c/sqrt(A_0) — lies between R_EH and R_PH and is proposed as the natural coupling cutoff between these geometric regions. The hypothesis suggests that no separate dark sector is required; the apparent dark components may emerge from the asymmetric causal structure of the observable universe. The work is preliminary.